<template>
  <view>
    <!-- 使用自定义搜索组件 -->
    <!-- <my-search bgcolor="#c00000" radius="3"></my-search> -->
    <my-search @click='gotoSearch'></my-search>
    <!-- 分类列表 -->
    <view class="scroll-view-container">
      <!-- 左侧的滑动区域 -->
      <scroll-view scroll-y="true" :style="{height: wh+'px'}" class="left-scroll-view" :scroll-into-view="scrollId">
        <block v-for="(item,index) in cateList" :key="index">
          <view :class="['left-scroll-view-item',index==active?'active':'']" @click="activeChanged(index)"
            :id="`left-scroll-id${index}`">
            {{item.cat_name}}
          </view>
        </block>
      </scroll-view>
      <!-- 右侧的滑动区域 -->
      <scroll-view scroll-y="true" :style="{height: wh+'px'}" class="right-scroll-view" :scroll-top="scrollTop">
        <block v-for="(item2,index2) in cateLevel2" :key="index2">
          <!-- 二级分类标题 -->
          <view class="cate-lv2-title">
            /{{item2.cat_name}}/
          </view>
          <!-- 三级分类内容 -->
          <view class="cate-lv3-list">
            <view class="cate-lv3-item" v-for="(item3,index3) in item2.children" :key="index3"
              @click="gotoGoodsList(item3)">
              <!-- 图片 -->
              <image :src="item3.cat_icon.replace('ugo-dev','hmugo-web')"></image>
              <!-- 文本 -->
              <text>{{item3.cat_name}}</text>
            </view>
          </view>
        </block>
        <view class="next-cate">
          <view class="next-box" v-if="active+1<cateList.length" @click="nextCate">
            点击下一个:<text>{{cateList[active+1].cat_name}}</text>
          </view>
          <view class="next-box" v-else> 下面已经没有了 </view>
        </view>
      </scroll-view>
    </view>
  </view>
</template>

<script>
  import badgeMix from '@/mixins/tabbar-badeg.js'
  export default {
    mixins: [badgeMix],
    data() {
      return {
        // 当前设备可用高度
        wh: 0,
        // 分类数据列表
        cateList: [],
        active: 0,
        // 二级分类列表
        cateLevel2: [],
        scrollTop: 0,
        scrollId: 'left-scroll-id0'
      };
    },
    onLoad() {
      const sysInfo = uni.getSystemInfoSync()
      this.wh = sysInfo.windowHeight - 50
      this.getCateList()
    },
    methods: {
      async getCateList() {
        const {
          data: res
        } = await uni.$http.get('/api/public/v1/categories')
        if (res.meta.status !== 200) return uni.$showMsg()
        this.cateList = res.message
        // console.log(this.cateList);
        // 为二级分类赋值
        this.cateLevel2 = res.message[0].children
      },
      activeChanged(index) {
        this.active = index
        // 重新为二级分类赋值
        this.cateLevel2 = this.cateList[index].children
        this.scrollTop = this.scrollTop == 0 ? 1 : 0

        this.scrollId = `left-scroll-id${index}`

      },
      gotoGoodsList(item3) {
        uni.navigateTo({
          url: '/subpkg/goods_list/goods_list?cid=' + item3.cat_id
        })
      },
      gotoSearch() {
        // 需要在组件创建click函数才能使用这个方法
        uni.navigateTo({
          url: '/subpkg/search/search'
        })
      },
      // 到下一个一级分类
      nextCate() {
        this.activeChanged(this.active + 1)
      }
    }
  }
</script>

<style lang="scss">
  .scroll-view-container {
    display: flex;

    .left-scroll-view {
      width: 120px;

      .left-scroll-view-item {
        background-color: #f7f7f7;
        line-height: 60px;
        text-align: center;
        font-size: 12px;

        &.active {
          // 既包含.left-scroll-view-item又包含.active
          background-color: #ffffff;
          position: relative;

          &::before {
            content: '  ';
            display: block;
            width: 3px;
            height: 30px;
            background-color: red;
            position: absolute;
            top: 50%;
            left: 0;
            transform: translateY(-50%);
          }
        }
      }
    }
  }

  .cate-lv2-title {
    font-size: 12px;
    font-weight: bold;
    text-align: center;
    padding: 15px 0;
  }

  .cate-lv3-list {
    display: flex;
    flex-wrap: wrap;

    .cate-lv3-item {
      width: 33.33%;
      display: flex;
      flex-direction: column;
      justify-content: center;
      align-items: center;
      margin: 10px 0;

      image {
        width: 60px;
        height: 60px;
      }
    }
  }

  .next-cate {
    display: flex;
    align-items: center;
    justify-content: center;

    .next-box {
      background-color: rgba(0, 255, 127, 0.8);
      width: 100%;
      text-align: center;

      text {
        color: red;
      }
    }
  }
</style>